Light fixture



LIGHT FIXTURE Filed Sept. 27,1922

Inventor Gomuzell A.B.Hlvm J;

Rh Attorney.

' is one continuous piece.

Patented July 14, 1925.

UNITED STATES PATENT OFFICE.

ERAL ELECTRIC COMPANY; A CORPORATION OF NEW YORK.

menu. FIXTURE.

Application filed September 27, 1922. Serial No. 590,982.

To all whom it may com-em:

Be it known that I, CRoMwELL A. B. HAL- VORSON, J12, a citizen of theUnited States, residing at Lynn, county of Essex, State ofMassachusetts, have invented certain new and useful Improvements inLight Fixtures, of which the following is a specification.

My invention relates to improvements in light fixtures for floodlighting; that is for distributing the light over a certain restrictedzone or zones. Hereto-fore, fixtures of this kind have been made withcertain elements for reflecting purposes and with certain otheradditional elements for r e fracting purposes; each separate andseparately mounted. and therefore calling for complicated mountingequipment. Among the objects of my invention are :to provide an improvedflood lighting device combining the reflecting and refracting elementsall in one unit; to provide a device of- :the above general characterwhich is simple inconstruction, cheap to manufacture and with simplemounting equipment; and to provide other details of improvement all ofwhich are hereinafter more fully set forth and claimed in theaccompanying specification, reference bein had to-the accompanyingdrawing in which Fig. l is a view in elevation of the fixture of myinvention shown partially in section to more clearly illustrate thereflecting and refracting elements and their relation to the lightsource; Fig. 2 is an enlarged detail section of the reflector part ofthe-unit. Referring more in detail to the drawing, it will be seen thatI provide a main flaring globe holder 2 which it will be understood maybe adapted to fit into any suitable standard or pendant depending uponwhether the unit is to be stationary or otherwise. Within the holder ishung or secured the lamp 3 within which latter is the source of light 4.Surrounding the lamp is the globe proper which is made of glass and Thisglobe has an upper curved sloping section 5 the outer surface of whichis covered by a light reflecting silver surface 6. Depending from thereflector section 6 is an annular section 7 the outer surface of whichis rippled. These ripples may be considered as irregular branching lenslike ridges and depressions the function of which is to diffuse thelight rays within a given zone. Sloping upwardly and toward the centerof the hood fromthe lower edgeof the surface 7 there is a conicalsurface 8 the outer portion of which is also covered by a reflectingsurface of silver 9. This conical surface is truncated and nestling onthe top of this truncated cone there is another surface 10concavo-convex in form the convex portion of which projects downwardly.The concave side of this surface is also rippled after the fashion ofthe surface 7. With the above arrangement the rays from the source oflight pass through the glass section 7 and are refracted in a generaldownwardly directlon forming an inclined conical zone of light. Certainof the raysof light are first reflected by the silver surface 6 onto thesecond silver surface 9' from which they are again reflected through thewall 7 as indicated by the dotted lines 11. All of the rays that passthrough this wall whether they come direct or whether they arereflected, are scattered or diffused in a general downwardly inclinedconical zone. Certain other of the rays of light pass directly from thesource of light 4 through the concavoconvex bottom surface 10 beingdiffused in passing through this surface over a second conical zone theapex of which is somewhere in the neighborhood of the light. Thereflecting surface may be prepared by a chemical deposit of silver 12(Fig. 2) over which as a protection to the silver a comparatively heavylayer of copper 13 is also deposited. This copper deposit is carriedover the ribs 14:, 15 and 16 (Fig. 1) for the purpose of securelyanchoring the deposits to the glass surface.

As shown in Fig. 1, the upper part of the globe is provided with asuitable groove 17 on the outside of the neck portion of the globe forthe purpose of securing the globe to the globe holder through the mediumof suitable screws 18. As I have indicated in the drawing (Fig. 1), theupper surface 5 is curved into a parabolic surface. On the other hand,the reflecting surface 8 is a conical reflecting surface. The relationof the surfaces 6 and 8 to each other are such that all rays of lightfrom the light source 4 that strike the surface 6 are reflected onto thesurface 8 from which latter surface they are reflected through therefracting or diffusing wall 7.

It will be understood that I contemplate also making a globe whichencloses the light

